The Pt/h-BN/BiOBr composite towards photocatalytic degradation of bisphenol A: the synergistic effect of h-BN and Pt
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The Pt/h‑BN/BiOBr composite towards photocatalytic degradation of bisphenol A: the synergistic effect of h‑BN and Pt Bing He1 · Wenhui He1 · Yawen Wang1 Received: 21 February 2020 / Accepted: 11 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Semiconductor photocatalyst as a new type of green and sustainable energy material has extensively used in wastewater and gas treatment. In this work, we prepared Pt/h-BN/BiOBr composite by an alcohol-soluble hydrolysis-assisted photoreduction method. The photocatalytic activity was evaluated by the degradation of bisphenol A under simulated sunlight, and the degradation efficiency of BiOBr, h-BN/BiOBr, Pt/BiOBr, and Pt/h-BN/BiOBr were 55.13%, 74.91%, 89.00%, and 98.54%, respectively. The results showed single composited with h-BN or Pt could improve the photocatalytic performance of BiOBr, while double composited with h-BN and Pt could play a synergistic effect on further improving the activity. The interaction between h-BN and BiOBr was electrostatic interactions, and that Pt as a plasma metal was coupling with BiOBr due to its localized surface plasmon resonance (LSPR) effect. The composition, morphology, optical property, and separation efficiency of photo-induced carriers and dominant active radicals were investigated. Based on the results, a possible mechanism was proposed. The excellent photocatalytic activity of Pt/h-BN/BiOBr composite photocatalyst could be attributed to the broadened light-response range after Pt loading, and enhanced electron–hole separation efficiency due to the electron capturer role of Pt and the hole transfer function of h-BN. Keywords Pt/h-BN/BiOBr · Bisphenol A · Photocatalytic degradation · Synergistic effect
1 Introduction Bisphenol A (BPA) being an essential industrial chemical had been extensively used in all aspects of life, whereas it had been proved to cause serious water pollution [1, 2]. Therefore, the elimination of BPA in aqueous solution had become an immediate problem. Among several physical–chemical methods, photocatalytic technology was considered to be a potential way to degrade pollutants in a green way [3–5]. BiOX (X = Cl, Br, and I) as typical V–VI–VII ternary oxide semiconductors occasioned great interest recently attributing to its unique layer structure [6, 7]. Their layered structure interleaved with [Bi2O2] slabs and halogen atom slabs formed internal electric fields and thus enhanced the separation of photogenerated carriers [8–10]. BiOBr has * Yawen Wang [email protected] 1
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People’s Republic of China
attracted much attention due to its suitable energy band structure and optical stability [11], and has been comprehensively employed to eliminate pollutants [12–16], fix dinitrogen [12, 17, 18], and reduce carbon dioxide [19–21]. Nevertheless, the application of BiOBr is still limited by the shortcomings of BiOBr, such as the small specific surface, poor visible-light respon
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